http://www.subsim.com/radioroom/showthread.php?t=146795
if upi scroll down you'll get a few vids and other topics you need for manual TDC. I recommend the DIIIck O' Kane targeting video. For me its the easiest to learn. There should be a button on your hud to take them off battlestations if anything else just press F1 and you get a list of the keyboard mapping.